EP1920013B1 - A jet ink and ink jet printing process - Google Patents
A jet ink and ink jet printing process Download PDFInfo
- Publication number
- EP1920013B1 EP1920013B1 EP06765215A EP06765215A EP1920013B1 EP 1920013 B1 EP1920013 B1 EP 1920013B1 EP 06765215 A EP06765215 A EP 06765215A EP 06765215 A EP06765215 A EP 06765215A EP 1920013 B1 EP1920013 B1 EP 1920013B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- ink
- sensitizer
- process according
- radiation
- photoinitiator
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
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- 238000000034 method Methods 0.000 title claims abstract description 25
- 238000007641 inkjet printing Methods 0.000 title claims abstract description 17
- 230000005855 radiation Effects 0.000 claims abstract description 44
- -1 oxirane, cyclic ester Chemical class 0.000 claims abstract description 22
- 150000005676 cyclic carbonates Chemical class 0.000 claims abstract description 19
- 239000000178 monomer Substances 0.000 claims abstract description 19
- 238000007639 printing Methods 0.000 claims abstract description 12
- XMBWDFGMSWQBCA-UHFFFAOYSA-N hydrogen iodide Chemical class I XMBWDFGMSWQBCA-UHFFFAOYSA-N 0.000 claims abstract description 11
- 239000000758 substrate Substances 0.000 claims abstract description 10
- 125000002091 cationic group Chemical group 0.000 claims abstract description 8
- 239000000203 mixture Substances 0.000 claims description 31
- YIKSHDNOAYSSPX-UHFFFAOYSA-N 1-propan-2-ylthioxanthen-9-one Chemical compound S1C2=CC=CC=C2C(=O)C2=C1C=CC=C2C(C)C YIKSHDNOAYSSPX-UHFFFAOYSA-N 0.000 claims description 8
- VKQJCUYEEABXNK-UHFFFAOYSA-N 1-chloro-4-propoxythioxanthen-9-one Chemical group S1C2=CC=CC=C2C(=O)C2=C1C(OCCC)=CC=C2Cl VKQJCUYEEABXNK-UHFFFAOYSA-N 0.000 claims description 7
- IAYPIBMASNFSPL-UHFFFAOYSA-N Ethylene oxide Chemical compound C1CO1 IAYPIBMASNFSPL-UHFFFAOYSA-N 0.000 claims description 7
- KSMGAOMUPSQGTB-UHFFFAOYSA-N 9,10-dibutoxyanthracene Chemical group C1=CC=C2C(OCCCC)=C(C=CC=C3)C3=C(OCCCC)C2=C1 KSMGAOMUPSQGTB-UHFFFAOYSA-N 0.000 claims description 3
- 150000001491 aromatic compounds Chemical class 0.000 claims description 3
- YRHRIQCWCFGUEQ-UHFFFAOYSA-N thioxanthen-9-one Chemical group C1=CC=C2C(=O)C3=CC=CC=C3SC2=C1 YRHRIQCWCFGUEQ-UHFFFAOYSA-N 0.000 claims description 3
- 125000004642 (C1-C12) alkoxy group Chemical group 0.000 claims description 2
- 125000004400 (C1-C12) alkyl group Chemical group 0.000 claims description 2
- 150000001454 anthracenes Chemical class 0.000 claims description 2
- 229910052736 halogen Chemical group 0.000 claims description 2
- 150000002367 halogens Chemical group 0.000 claims description 2
- 229910052739 hydrogen Inorganic materials 0.000 claims description 2
- 239000001257 hydrogen Substances 0.000 claims description 2
- 150000007964 xanthones Chemical class 0.000 claims description 2
- 150000002431 hydrogen Chemical group 0.000 claims 1
- 239000000976 ink Substances 0.000 description 99
- 150000002924 oxiranes Chemical class 0.000 description 9
- QYKIQEUNHZKYBP-UHFFFAOYSA-N Vinyl ether Chemical compound C=COC=C QYKIQEUNHZKYBP-UHFFFAOYSA-N 0.000 description 5
- 125000004122 cyclic group Chemical group 0.000 description 5
- AHHWIHXENZJRFG-UHFFFAOYSA-N oxetane Chemical compound C1COC1 AHHWIHXENZJRFG-UHFFFAOYSA-N 0.000 description 5
- RUOJZAUFBMNUDX-UHFFFAOYSA-N propylene carbonate Chemical compound CC1COC(=O)O1 RUOJZAUFBMNUDX-UHFFFAOYSA-N 0.000 description 5
- 238000009472 formulation Methods 0.000 description 4
- YEJRWHAVMIAJKC-UHFFFAOYSA-N 4-Butyrolactone Chemical class O=C1CCCO1 YEJRWHAVMIAJKC-UHFFFAOYSA-N 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 230000001627 detrimental effect Effects 0.000 description 3
- 239000000543 intermediate Substances 0.000 description 3
- 150000002596 lactones Chemical class 0.000 description 3
- 150000002921 oxetanes Chemical class 0.000 description 3
- 239000000049 pigment Substances 0.000 description 3
- 229920003023 plastic Polymers 0.000 description 3
- 239000004033 plastic Substances 0.000 description 3
- 241000894007 species Species 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 2
- MWPLVEDNUUSJAV-UHFFFAOYSA-N anthracene Natural products C1=CC=CC2=CC3=CC=CC=C3C=C21 MWPLVEDNUUSJAV-UHFFFAOYSA-N 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 229910001882 dioxygen Inorganic materials 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 239000003381 stabilizer Substances 0.000 description 2
- 239000001993 wax Substances 0.000 description 2
- ZZXUZKXVROWEIF-UHFFFAOYSA-N 1,2-butylene carbonate Chemical compound CCC1COC(=O)O1 ZZXUZKXVROWEIF-UHFFFAOYSA-N 0.000 description 1
- FDANDLMXLXNKKB-UHFFFAOYSA-N 1-butylthioxanthen-9-one Chemical compound S1C2=CC=CC=C2C(=O)C2=C1C=CC=C2CCCC FDANDLMXLXNKKB-UHFFFAOYSA-N 0.000 description 1
- BTJPUDCSZVCXFQ-UHFFFAOYSA-N 2,4-diethylthioxanthen-9-one Chemical compound C1=CC=C2C(=O)C3=CC(CC)=CC(CC)=C3SC2=C1 BTJPUDCSZVCXFQ-UHFFFAOYSA-N 0.000 description 1
- ZCDADJXRUCOCJE-UHFFFAOYSA-N 2-chlorothioxanthen-9-one Chemical compound C1=CC=C2C(=O)C3=CC(Cl)=CC=C3SC2=C1 ZCDADJXRUCOCJE-UHFFFAOYSA-N 0.000 description 1
- OQLYXVNGGPAJBO-UHFFFAOYSA-N 2-propoxythioxanthen-9-one Chemical compound C1=CC=C2C(=O)C3=CC(OCCC)=CC=C3SC2=C1 OQLYXVNGGPAJBO-UHFFFAOYSA-N 0.000 description 1
- BJWMSGRKJIOCNR-UHFFFAOYSA-N 4-ethenyl-1,3-dioxolan-2-one Chemical compound C=CC1COC(=O)O1 BJWMSGRKJIOCNR-UHFFFAOYSA-N 0.000 description 1
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical class S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 description 1
- BVTJGGGYKAMDBN-UHFFFAOYSA-N Dioxetane Chemical compound C1COO1 BVTJGGGYKAMDBN-UHFFFAOYSA-N 0.000 description 1
- 239000004593 Epoxy Substances 0.000 description 1
- KMTRUDSVKNLOMY-UHFFFAOYSA-N Ethylene carbonate Chemical compound O=C1OCCO1 KMTRUDSVKNLOMY-UHFFFAOYSA-N 0.000 description 1
- 206010073306 Exposure to radiation Diseases 0.000 description 1
- 239000005062 Polybutadiene Substances 0.000 description 1
- 241001649137 Vernonia galamensis Species 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 229920006397 acrylic thermoplastic Polymers 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 239000002318 adhesion promoter Substances 0.000 description 1
- 150000001336 alkenes Chemical class 0.000 description 1
- 125000005577 anthracene group Chemical group 0.000 description 1
- 229930188620 butyrolactone Natural products 0.000 description 1
- 125000004432 carbon atom Chemical group C* 0.000 description 1
- SAQPWCPHSKYPCK-UHFFFAOYSA-N carbonic acid;propane-1,2,3-triol Chemical compound OC(O)=O.OCC(O)CO SAQPWCPHSKYPCK-UHFFFAOYSA-N 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- GYZLOYUZLJXAJU-UHFFFAOYSA-N diglycidyl ether Chemical class C1OC1COCC1CO1 GYZLOYUZLJXAJU-UHFFFAOYSA-N 0.000 description 1
- 239000003085 diluting agent Substances 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 239000000975 dye Substances 0.000 description 1
- 238000010894 electron beam technology Methods 0.000 description 1
- 238000006735 epoxidation reaction Methods 0.000 description 1
- 150000002118 epoxides Chemical class 0.000 description 1
- 150000002148 esters Chemical class 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 238000007646 gravure printing Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 125000004435 hydrogen atom Chemical group [H]* 0.000 description 1
- 125000002768 hydroxyalkyl group Chemical group 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
- 239000003999 initiator Substances 0.000 description 1
- MGFYSGNNHQQTJW-UHFFFAOYSA-N iodonium Chemical compound [IH2+] MGFYSGNNHQQTJW-UHFFFAOYSA-N 0.000 description 1
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 1
- 229910052753 mercury Inorganic materials 0.000 description 1
- 150000002790 naphthalenes Chemical class 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 235000019198 oils Nutrition 0.000 description 1
- 239000005022 packaging material Substances 0.000 description 1
- 239000004014 plasticizer Substances 0.000 description 1
- 229920003229 poly(methyl methacrylate) Polymers 0.000 description 1
- 229920002857 polybutadiene Polymers 0.000 description 1
- 229920005862 polyol Polymers 0.000 description 1
- 150000003077 polyols Chemical class 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 150000003254 radicals Chemical class 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000007151 ring opening polymerisation reaction Methods 0.000 description 1
- 230000001235 sensitizing effect Effects 0.000 description 1
- 235000012424 soybean oil Nutrition 0.000 description 1
- 239000003549 soybean oil Substances 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000004094 surface-active agent Substances 0.000 description 1
- ISXSCDLOGDJUNJ-UHFFFAOYSA-N tert-butyl prop-2-enoate Chemical compound CC(C)(C)OC(=O)C=C ISXSCDLOGDJUNJ-UHFFFAOYSA-N 0.000 description 1
- 231100000440 toxicity profile Toxicity 0.000 description 1
- 238000002211 ultraviolet spectrum Methods 0.000 description 1
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 1
- 229920002554 vinyl polymer Polymers 0.000 description 1
- PAPBSGBWRJIAAV-UHFFFAOYSA-N ε-Caprolactone Chemical compound O=C1CCCCCO1 PAPBSGBWRJIAAV-UHFFFAOYSA-N 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D11/00—Inks
- C09D11/02—Printing inks
- C09D11/10—Printing inks based on artificial resins
- C09D11/101—Inks specially adapted for printing processes involving curing by wave energy or particle radiation, e.g. with UV-curing following the printing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M5/00—Duplicating or marking methods; Sheet materials for use therein
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D11/00—Inks
- C09D11/30—Inkjet printing inks
Definitions
- the invention relates to an ink for use in ink jet printing (a jet ink) and to an ink jet printing process.
- Free-radically curable jet inks have been developed that contain polymerisable monomers that readily crosslink via a chain reaction involving free radical intermediates following exposure to radiation, such as ultraviolet light or electron beam radiation. Free-radically curable jet inks are known for their ability to jet reliably and can be formulated with a wide degree of flexibility. They tend to offer satisfactory performance properties on a variety of media, such as packaging materials made from coated papers and plastics. However, free-radically curable jet inks traditionally have poor adhesion properties when applied to difficult substrates such as acrylics. Furthermore, free-radically curable jet inks often exhibit undesirably high levels of shrinkage when cured.
- Cationically curable jet inks cure via a chain reaction involving cationic intermediates.
- Cationically curable jet inks that exhibit improved adhesion to demanding substrates compared to free-radiacally curable inks have been developed for traditional printing applications such as flexo or gravure printing processes.
- a lack of flexibility in the formulation of such inks arising from the somewhat limited range of suitable commercially available raw materials for cationically curable inks together with longer curing times and/or large doses or radiation required to reach full cure hardness has limited their use in ink jet printing applications.
- UV lamps that emit radiation at wavelengths between 200nm and 450nm are widely used for that purpose.
- Traditional UV lamps are often very inefficient with only a small proportion of the radiation being emitted at the desired wavelengths.
- Traditional UV lamps are also temperature sensitive, that is, they emit light at the required wavelength only when warm. Accordingly, the response time of the lamp can be slow requiring them to be warmed up prior to use or the lamps need to be kept warm on a standby mode, which is wasteful of energy.
- the light intensity is often variable from traditional UV lamps leading to variations in the properties of the cured ink.
- traditional UV lamps are typically large and heavy so they are difficult to mount on ink jet printing heads, especially printing heads that are mounted on a moving carriage and single pass print heads.
- Printing processes that employ single pass printing heads require the use of ink formulations that cure rapidly from a single relatively low dose (for example less than 500mJ/cm 2 ) of radiation from a radiation source that is typically mounted on or close to the print head.
- Single pass printing systems refer to those in which the image is printed on a single pass of the substrate under the print head.
- single pass print heads must be wide enough to extend across the width of a substrate.
- the invention provides a process of ink jet printing which comprises the steps of printing an ink onto a substrate and curing the ink using radiation from an LED, in which the ink comprises a cationically curable component, an iodonium salt photoinitiator and a sensitizer, wherein the cationically curable component comprises at least one cyclic carbonate or cyclic ester monomer.
- LED devices are typically relatively low cost devices as compared to traditional UV lamps. Moreover, LED UV light sources can operate at relatively low temperatures, can have rapid response times not requiring pre-heating, are relatively compact and light, and are relatively easy to integrate into digital equipment and print heads mounted on moving carriages.
- the LED radiation source may comprise an array of LED devices. The array of LED devices may, for example, be mounted across the width of a single pass print head.
- an inerting environment is not provided in the region of the LED radiation source.
- Cationic curing ink jet inks according to the invention may be cured in the presence of oxygen obviating the need for an inert oxygen-free environment, such as a nitrogen blanket, to be provided to prevent oxygen inhibition during curing.
- the ink is applied from a heated print head.
- the process is a single pass ink jet printing process.
- the cationically curable inks of the invention can display a satisfactory level of cure when irradiated by LED UV lamps.
- Iodonium salt photoinitiators do not typically absorb sufficient radiation in the absence of sensitizers to initiate cationic chain reactions at wavelengths over 300nm (a typical maximum absorption of an iodonium salt being approximately 250nm) to be activated by LED UV radiation sources, but it has been found that iodonium salt photoinitiators can be effectively sensitised by sensitizers that absorb UV radiation at a wavelength in the range emitted by LED devices whereas other types of photoinitiator, such as triaryl sulphonium salts, are more difficult to effectively sensitise and typically do not absorb the relatively long wavelength radiation typically generated by LED radiation sources.
- iodonium salt photoinitiators can be used in the process and inks of the invention with ditolyl iodonium hexafluorophosphate (sold under the trade name Omnicat 440) being preferred.
- the sensitizer is able to absorb radiation at a wavelength in the range of from 300nm to 420nm.
- LED UV radiation sources typically emit radiation at wavelengths within that range with 390 being a common peak emission wavelength for commercially available LED devices.
- the sensitizer absorbs radiation at a wavelength in the range of from 360, to 405nm and more preferably from 380 to 400nm.
- the sensitizer is selected from the group consisting of: substituted and unsubstituted polynuclear aromatic compounds such as naphthalenes, anthracenes and pyracenes, and substituted and unsubstituted thioxanthones and xanthones.
- sensitizers have been found to be particularly effective in sensitising iodonium salts and absorb radiation at a wavelength which is emitted by a LED UV source, for example, a wavelength in the range of from 300nm to 420nm.
- Other sensitizers that absorb radiation at such wavelengths may also be used as sensitizers for the inks of the invention such as conjugated aromatic compounds, for example, hydroxyl alkyl phenone photoinitiators.
- the sensitizer is an anthracene, preferably an alkoxy anthracene and more preferably the sensitizer is dibutoxy anthracene (DBA). DBA has been found to be a particularly effective sensitizer for use in the ink compositions of the invention.
- Thioxanthone sensitizers have also been found to be effective sensitizers for use in the ink compositions of the invention. Moreover, thioxanthones display solubilities that are particularly suited to some ink compositions. Furthermore, thioxanthones typically have relatively good toxicity profiles.
- the sensitizer is a thioxanthone of formula I: wherein each R is independently selected from hydrogen, C 1-12 alkyl, C 1-12 alkoxy or a halogen.
- the sensitizer is 1-chloro-4-propoxythioxanthone (CPTX) or isopropyl thioxanthone (ITX).
- ITX is a relatively inexpensive sensitizer.
- Other thioxanthones initiators that may be suitable for inclusion in ink compositions of the invention include isopropyl thioxanthone, 2,4-diethyl thioxanthone, 2- t butyl thioxanthone, 2-chlorothioxanthone and 2-propoxy thioxanthone.
- the ink comprises from 1 to 10% by weight photoinitiator based on the total ink composition.
- photoinitiator levels of photoinitiator have been found to provide ink compositions that display acceptable levels of cure with a level in the range of from 2 to 6% by weight being preferred.
- the ratio of photoinitiator to sensitizer is from 20:1 to 0.1:1 by weight, preferably, the ratio is from 10:1 to 1:1, and more preferably the ratio of photoinitiator to sensitizer is from 4:1 to 2:1 by weight.
- Such levels of sensitizer have been found to enable good levels of cure when the ink composition is irradiated using UV radiation from an LED radiation source.
- Suitable monomers which may be present in the ink in combination with cyclic carbonate on cyclic ester monomers include oxirane species with cycloaliphatic expoxides, especially 3,4-epoxy cyclohexyl methyl-3,4-epoxy cyclohexyl carboxylate, being preferred.
- Oxirane (also known as epoxide) monomers undergo cationic ring-opening polymerisation and are widely used in printing inks with cycloaliphatic oxiranes in particular.
- the inks comprise from 20% to 80% by weight, preferably from 20% to 50% by weight, oxirane monomer.
- Some ink compositions according to the invention have been found to display especially good cure properties when they comprise at least 20% oxirane monomer by weight.
- Cycloaliphatic oxiranes (such as those sold under the designations Cyracure UVR6105, UVR6107, UVR6110 and UVR6128, by Dow), are particularly preferred because they tend to cure relatively quickly compared to linear oxiranes.
- Other preferred oxiranes include such epoxy-functional oligomers/monomers as the glycidyl ethers of polyols.
- oxiranes derived by the epoxidation of unsaturated materials may also be suitable, for example, epoxidised soybean oil, epoxidised polybutadiene or epoxidised alkenes.
- Naturally occurring oxiranes may also be suitable, including the crop oil collected from Vernonia galamensis.
- the high viscosity of many suitable oxiranes means that jet ink compositions including oxiranes as a polymerisable species must typically be "cut” with other compounds that act as diluents to reduce the viscosity of the composition.
- the ink comprises a cyclic ester. It has been found that in the inclusion of cyclic ester compounds, such as lactones, in curable ink jet inks according to the invention provides an ink with a viscosity suitable for ink jet printing together with good cure properties. This finding is surprising as it was widely believed that cyclic esters would be unreactive species in cationically curable inks having a detrimental effect on the curing of an ink and, in particular, that they would inhibit cure speeds and create tacky films if used in high levels.
- cyclic ester compounds such as lactones
- Cyclic esters are commercially available which are relatively inexpensive are substantially odourless and have excellent health and safety profiles.
- the cyclic ester includes a 4-, 5-, 6- or 7- membered lactone ring.
- Esters including strained rings of 5 to 7 members (4 to 6 carbon atoms in the ring) have been found to be preferred.
- Preferred cyclic esters are selected from the group consisting of butyrolactones, valerolactones or caprolactones and more preferably the cyclic ester is ⁇ -butyrolactone or ⁇ -caprolactone.
- Such lactones have low viscosities and can be used to formulate inks having good curing profiles. Furthermore, they are relatively cheap and readily available.
- the inks comprise at least 3%, preferably at least 5%, more preferably at least 10% and especially at least 12% by weight cyclic ester. It has been found that levels of cyclic ester in ink jet ink compositions of 3% and above are not as detrimental to the cure of the inks as previously supposed and that when present in an amount of at least 12%, for example, at least 15% by weight of the ink, that the viscosity of the ink composition is lowered considerably.
- the inks comprise no more than 50%, preferably less than 40% and more preferably less than 35% by weight cyclic ester. Levels of cyclic esters from 10 to 30% and especially from 15 to 25% by weight of the ink are preferred.
- the ink comprises a cyclic carbonate. It has been found that the inclusion of cyclic carbonate components in cationically curable ink jet according to the invention provides inks with viscosities suitable for ink jet printing together with good cure properties. This finding is surprising as cyclic carbonates are deemed by most formulators and end users to be unreactive components and so would not have a positive effect on cure and, in particular, should not be included at high levels.
- the cyclic carbonate includes a 4-, 5-, 6- or 7- membered ring with 5- membered cyclic carbonates being preferred.
- Suitable cyclic carbonates include propylene carbonate, glycerine carbonate, vinyl ethylene carbonate, ethylene carbonate and butylene carbonate. Propylene carbonate is especially preferred.
- the inks comprise at least 3%, preferably at least 5% and more preferably at least 8% and especially at least 10% by weight cyclic carbonate. It has been found that levels of cyclic carbonate in ink jet ink compositions of 3% and above are not as detrimental to the cure of the inks as previously supposed and that when present in an amount of at least 8%, for example, at least 10% by weight of the ink, that the viscosity of the ink composition is lowered considerably.
- the inks comprise no more than 50%, preferably less than 40%, preferably less than 35% and especially less than 25% and especially by weight cyclic carbonate. Levels of cyclic carbonates of from 5 to 25% and especially from 8 to 15% by weight of the ink are preferred.
- the ink comprises propylene carbonate at a level of from 3 to 30% of the total ink composition by weight and more preferably from 5 to 20% by weight.
- the ink comprises an oxirane in combination with a cyclic ester and/or a cyclic carbonate.
- the inks of the invention may further comprise an oxetane monomer.
- the ink composition may comprise a vinyl ether. Oxetane and vinyl ether monomers are known to help achieve low viscosities (for example of less than 50 cPs at 25°C) in cationically cured ink compositions.
- Monofunctional oxetanes have the disadvantage that they are only suitable for use at low levels as the level of cure usually deteriorates when they are used at higher levels.
- Di-functional oxetanes have also been used but at the levels required to reduce the viscosity sufficiently for the ink to be used for ink jet printing, film shrinkage, poor adhesion and brittle films can occur.
- the approach of using of oxetane and some vinyl ether compounds in ink compositions has also been shown to lead to poor adhesion on swellable plastic substrates because those materials do not attack or etch into the plastic.
- compositions of the invention that comprise an oxirane monomer are cut with at least one cyclic carbonate and/or cyclic ester thereby reducing the level of oxetane and/or vinyl ether required to achieve suitable viscosities for ink jet printing.
- the substitution of oxetane or vinyl ether viscosity lowering agents by cyclic carbonate or cyclic esters has been found to improve the level and speed of cure at relatively low UV doses.
- the cure dose is less than 500mJ/cm 2 and preferably less than 200mJ/cm 2 .
- the ink compositions of the invention have often been found to cure at low UV doses compared with traditional cationically curable inks and also relative to free-radical curable inks, thereby allowing a reduction in the number and/or intensity of the LED's used with a consequent saving in cost.
- the invention further provides a cationic ink jet ink comprising:
- the ink viscosity is suitable for use in ink jet printing, for example, the viscosity is less than 50 mPas at 25°C and preferably less than 35 mPas at 25°C.
- Additives which may be used in conjunction with the principal components of the ink formulations of the present invention include stabilizers, plasticizers, pigments, waxes, slip aids, levelling aids, adhesion promoters, surfactants and fillers.
- the compositions of the present invention typically comprise, as additional components to those referred to above, one or more of pigments, dyes, waxes, stabilizers, and flow aids, for example as described in " The Printing Ink Manual", 5th Edition, edited by R.H. Leach et al., published in 1993 by Blueprint .
- Table 1 shows four ink compositions according to the invention (entries 2 to 5) together with a comparative example (entry 1) in which no sensitizer is present.
- Entry 1 shows that in the absence of a suitable sensitizer no curing of the ink is achieved using the LED radiation source.
- Doubling the amount of photoinitiator and sensitizer (whilst maintaining the photoinitiator: sensitizer ratio at 3:1) significantly decreased the radiation dose required to cure the ink as can be seen by comparing entry 5 with entry 3.
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- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Wood Science & Technology (AREA)
- Organic Chemistry (AREA)
- Ink Jet Recording Methods And Recording Media Thereof (AREA)
- Inks, Pencil-Leads, Or Crayons (AREA)
- Ink Jet (AREA)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GBGB0516515.4A GB0516515D0 (en) | 2005-08-11 | 2005-08-11 | A jet ink and ink jet printing process |
PCT/GB2006/002911 WO2007017644A1 (en) | 2005-08-11 | 2006-08-04 | A jet ink and ink jet printing process |
Publications (2)
Publication Number | Publication Date |
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EP1920013A1 EP1920013A1 (en) | 2008-05-14 |
EP1920013B1 true EP1920013B1 (en) | 2011-09-28 |
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EP06765215A Active EP1920013B1 (en) | 2005-08-11 | 2006-08-04 | A jet ink and ink jet printing process |
Country Status (13)
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US (1) | US20090286000A1 (ko) |
EP (1) | EP1920013B1 (ko) |
JP (1) | JP4959702B2 (ko) |
KR (1) | KR101290700B1 (ko) |
CN (1) | CN101291999B (ko) |
AT (1) | ATE526377T1 (ko) |
AU (1) | AU2006277837A1 (ko) |
BR (1) | BRPI0616496A2 (ko) |
CA (1) | CA2618757A1 (ko) |
GB (1) | GB0516515D0 (ko) |
TW (1) | TW200714487A (ko) |
WO (1) | WO2007017644A1 (ko) |
ZA (1) | ZA200801479B (ko) |
Cited By (1)
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WO2016153894A1 (en) | 2015-03-20 | 2016-09-29 | Blue Cube Ip Llc | Curable compositions |
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GB2423521A (en) * | 2005-02-25 | 2006-08-30 | Sun Chemical Ltd | Energy-curable coating composition |
JP4757572B2 (ja) * | 2005-09-05 | 2011-08-24 | 富士フイルム株式会社 | インク組成物、インクジェット記録方法、印刷物、平版印刷版の製造方法、及び、平版印刷版 |
US20100259589A1 (en) | 2009-04-14 | 2010-10-14 | Jonathan Barry | Inert uv inkjet printing |
GB0914653D0 (en) | 2009-08-21 | 2009-09-30 | Sericol Ltd | Printing ink |
JP5675817B2 (ja) | 2009-09-08 | 2015-02-25 | サン ケミカル ビー.ブイ. | 光開始剤組成物 |
JP5534175B2 (ja) * | 2010-02-04 | 2014-06-25 | 川崎化成工業株式会社 | 光カチオン重合増感剤組成物、光感応性酸発生剤組成物、光カチオン重合性組成物及び該光カチオン重合組成物を重合してなる重合物 |
US8567936B2 (en) * | 2010-11-10 | 2013-10-29 | Electronics For Imaging, Inc. | LED roll to roll drum printer systems, structures and methods |
US9487010B2 (en) | 2010-12-15 | 2016-11-08 | Electronics For Imaging, Inc. | InkJet printer with controlled oxygen levels |
US9527307B2 (en) | 2010-12-15 | 2016-12-27 | Electronics For Imaging, Inc. | Oxygen inhibition for print-head reliability |
CN103383330B (zh) * | 2012-05-04 | 2015-08-26 | 宏启胜精密电子(秦皇岛)有限公司 | 材料固化程度测试系统、测试方法及防焊层的制作方法 |
JP2016521217A (ja) * | 2013-04-03 | 2016-07-21 | サン ケミカル コーポレーション | Uv硬化型インクジェットとオーバープリントワニスの組合せ |
EP3725852A1 (en) | 2019-04-15 | 2020-10-21 | A.M. Ramp & Co. GmbH | Cationically curable inkjet composition |
AR125598A1 (es) | 2021-04-01 | 2023-08-02 | Sicpa Holding Sa | Barnices protectores catiónicos curables por radiación uv-led para documentos de seguridad |
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DE4417366A1 (de) * | 1994-05-18 | 1995-12-07 | Schmidt Gebr Druckfarben | Verfahren zum qualitätskontrollierten Veredeln einer Oberfläche mit einer strahlungsgehärteten Oberflächenveredelung |
US5856373A (en) * | 1994-10-31 | 1999-01-05 | Minnesota Mining And Manufacturing Company | Dental visible light curable epoxy system with enhanced depth of cure |
US5889084A (en) * | 1997-01-30 | 1999-03-30 | Ncr Corporation | UV or visible light initiated cationic cured ink for ink jet printing |
AU758652B2 (en) * | 1998-04-24 | 2003-03-27 | Ciba Specialty Chemicals Holding Inc. | Heavy metal-free coating formulations |
SG98433A1 (en) * | 1999-12-21 | 2003-09-19 | Ciba Sc Holding Ag | Iodonium salts as latent acid donors |
US6350792B1 (en) * | 2000-07-13 | 2002-02-26 | Suncolor Corporation | Radiation-curable compositions and cured articles |
US6720042B2 (en) * | 2001-04-18 | 2004-04-13 | 3M Innovative Properties Company | Primed substrates comprising radiation cured ink jetted images |
GB0204467D0 (en) * | 2002-02-26 | 2002-04-10 | Coates Brothers Plc | Novel fused ring compounds, and their use as cationic photoinitiators |
JP2004051923A (ja) | 2002-07-24 | 2004-02-19 | Konica Minolta Holdings Inc | 活性光線硬化型インク、画像形成方法、印刷物、記録装置 |
US7068898B2 (en) * | 2002-09-05 | 2006-06-27 | Nanosys, Inc. | Nanocomposites |
US7080900B2 (en) * | 2002-11-20 | 2006-07-25 | Konica Minolta Holdings, Inc. | Device and method for recording images |
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JP2004203025A (ja) * | 2002-12-12 | 2004-07-22 | Konica Minolta Holdings Inc | 画像記録装置 |
AU2003290316A1 (en) * | 2002-12-20 | 2004-07-14 | Inca Digital Printers Limited | Curing |
US7368215B2 (en) * | 2003-05-12 | 2008-05-06 | Eastman Kodak Company | On-press developable IR sensitive printing plates containing an onium salt initiator system |
US20060247401A1 (en) * | 2003-06-25 | 2006-11-02 | Masashi Date | Process for production of monosulfonium salts, cationic polymerization initiators, curable compositions, and products of curing |
KR100529371B1 (ko) * | 2003-07-29 | 2005-11-21 | 주식회사 엘지화학 | 촉매전구체 수지조성물 및 이를 이용한 투광성 전자파차폐재 제조방법 |
JP4556414B2 (ja) | 2003-10-22 | 2010-10-06 | コニカミノルタホールディングス株式会社 | インクジェット用インク及びそれを用いたインクジェット記録方法 |
JP4667145B2 (ja) * | 2004-07-22 | 2011-04-06 | 三井化学株式会社 | 光硬化型樹脂組成物及びそれからなるプラスチック用樹脂組成物 |
-
2005
- 2005-08-11 GB GBGB0516515.4A patent/GB0516515D0/en not_active Ceased
-
2006
- 2006-07-31 TW TW095127964A patent/TW200714487A/zh unknown
- 2006-08-04 AT AT06765215T patent/ATE526377T1/de not_active IP Right Cessation
- 2006-08-04 AU AU2006277837A patent/AU2006277837A1/en not_active Abandoned
- 2006-08-04 EP EP06765215A patent/EP1920013B1/en active Active
- 2006-08-04 CA CA002618757A patent/CA2618757A1/en not_active Abandoned
- 2006-08-04 BR BRPI0616496A patent/BRPI0616496A2/pt not_active IP Right Cessation
- 2006-08-04 WO PCT/GB2006/002911 patent/WO2007017644A1/en active Application Filing
- 2006-08-04 US US12/063,503 patent/US20090286000A1/en not_active Abandoned
- 2006-08-04 CN CN2006800368939A patent/CN101291999B/zh not_active Expired - Fee Related
- 2006-08-04 KR KR1020087005902A patent/KR101290700B1/ko not_active IP Right Cessation
- 2006-08-04 JP JP2008525617A patent/JP4959702B2/ja not_active Expired - Fee Related
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2008
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Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2016153894A1 (en) | 2015-03-20 | 2016-09-29 | Blue Cube Ip Llc | Curable compositions |
Also Published As
Publication number | Publication date |
---|---|
EP1920013A1 (en) | 2008-05-14 |
KR101290700B1 (ko) | 2013-07-31 |
KR20080034036A (ko) | 2008-04-17 |
ATE526377T1 (de) | 2011-10-15 |
ZA200801479B (en) | 2009-07-29 |
TW200714487A (en) | 2007-04-16 |
WO2007017644A1 (en) | 2007-02-15 |
JP4959702B2 (ja) | 2012-06-27 |
CA2618757A1 (en) | 2007-02-15 |
US20090286000A1 (en) | 2009-11-19 |
GB0516515D0 (en) | 2005-09-21 |
JP2009504441A (ja) | 2009-02-05 |
CN101291999B (zh) | 2012-06-13 |
BRPI0616496A2 (pt) | 2016-09-27 |
CN101291999A (zh) | 2008-10-22 |
AU2006277837A1 (en) | 2007-02-15 |
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